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Forum: CFX

November 15, 2013, 08:55

Replies: 6

Diagnosing linear solving failure

Views: 1,974

Posted By siw

Thanks Glenn. Drastically reducing the physical...

Thanks Glenn. Drastically reducing the physical timescale has done the trick. I've always in the past been successful with a timescale of about 1/2 to 1/4 of the dynamical flow through time, as per...

Forum: CFX

November 14, 2013, 06:39

Replies: 6

Diagnosing linear solving failure

Views: 1,974

Posted By siw

I initialize the flowfield with the freestream...

I initialize the flowfield with the freestream conditions and use a physical timescale (it's a steady simulation) in based on the dynamical flow time past the body of interest. I'll reduce the...

Forum: CFX

November 14, 2013, 02:11

Replies: 6

Diagnosing linear solving failure

Views: 1,974

Posted By siw

Thanks Glenn, I did read that link. I've...

Thanks Glenn, I did read that link.

I've never had CFX fail on the first iteration before, when I've had it fail on other jobs its been due to divergence as the solution progressed.

Not sure...

Forum: CFX

November 13, 2013, 06:58

Replies: 6

Diagnosing linear solving failure

Views: 1,974

Posted By siw

Diagnosing linear solving failure

Hi,

I'm running an incompressible, external aerodynamics testcase in CFX:

Steady RANS with SST.
Air at 25 deg C material.
Isothermal for energy equation.
Velocity inlet, pressure outlet,...

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